Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.
Chemistry is the science and study of matter, including its properties, composition as well as reactivity. Chemistry relates to everything that can be sensed from the minute elements to complex structures. The atom and molecules are the basic unit or components of Chemistry.
The law of the conservation of mass. The law of constant proportions. The law of multiple proportions. The law of reciprocal proportions.
Traditionally, chemistry has been broken into five main subdisciplines:
1. Organic chemistry,
2. Analytical chemistry,
3. Physical chemistry,
4. Inorganic chemistry and